This is a very important element of research.
Basically, citing a source is giving credit where credit is due. When you use someone else's intellectual property (their words and/or ideas) you must tell the reader that another person's work helped in your endeavor.
Many classes at William Jewell use the APA or American Psychological Association style. Others use MLA or Modern Language Association style. To help you get started with properly citing sources you may go to the Citation Machine from the Landmark Project. This source will help you with the basics of APA and MLA styles. Please be aware that both APA and MLA styles are very precise and it is necessary for you to double check your work with the print sources before turning in your assignments.
Curry Library has both print sources on reserve.
Publication Manual of the American Psychological Association (5th Edition)
808.066/P976
MLA Handbook (6th Edition)
808.02/M689g 2003